8:40 a.m.: Residual backups continue along U.S. 280 westbound, where an earlier six-vehicle accident blocked the entire roadway near Cahaba Valley Road. A lane is open through the area, though authorities strongly urge drivers to use alternate routes.

Elsewhere, heavy congestion continues along I-65 northbound, with speeds of about 20 mph from the Pelham area through Hoover and into Homewood.

Drivers also report delays along U.S. 280 from the I-459 interchange westbound, with sluggish speeds between the interstate and the Elton B. Stephens Expressway. Congestion also is backing onto the exit lane from I-459.

Traffic also slowing through the I-20/59 merge, as I-59 traffic from Trussville and I-20 traffic from Leeds converge.

Elsewhere, no major accidents have been reported, though congestion-related delays persist.

7:15 a.m.: An accident involving five vehicles has lanes blocked along U.S. 280 westbound near Cahaba Valley Road, according to Shelby County authorities.

Drivers report the middle and right westbound lanes are blocked near Corporate Drive, with people cutting through parking lots to get around the scene.

6:40 a.m.: No reports of major accidents or serious delays across the area.

Roads are wet in metro Birmingham, and authorities urge caution on roads north and northwest of the area because of the chance for wintry precipitation.

All interstates and major roadways are moving at or near posted speeds, though speeds are decreasing as traffic congestion builds.

6:10 a.m.: Drivers along Interstate 22 and Interstate 65 south into Birmingham have reported they didn't encounter any icing issues, though winter weather advisories have been posted for counties in northwestern Alabama.

Authorities still urge caution, especially on elevated roadways and bridges north of Birmingham.

In metro Birmingham, light rain is falling across the area with a heavier band draped across I-65 between Birmingham and Montgomery, and along I-20 between Birmingham and Anniston.

Estimated travel times (based on conditions at 6:04 a.m.):

15 minutes on I-20 westbound from the Leeds area to the I-20/59 split, average speed 60 mph

17 minutes on I-59 southbound from the Trussville area to the I-20/59 split, average speed 60 mph

30 minutes on I-20/59 eastbound from the Woodstock area through I-459 to downtown, average speeds 50 to 60 mph